Yes, absolutely. You can either install roundcube as a standalone on your AWS setup, or if you already have Roundcube running, you can add any of our plugins and skins by uploading it to your existing installation.

If you're running whm/cpanel, Roundcube is installed in this directory:

/usr/local/cpanel/base/3rdparty/roundcube

If you have access to this directory, and can copy the skin/plugin files there, you'll be able to install our software for all the users.

If you can not access the above directory, you can install your own copy of Roundcube in a folder that you have full control over and make it accessible under a subdomain.